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| Home > Publications database > Annual report / Forschungszentrum Jülich Institut für Kernphysik: 1996 |
| Book/Report | FZJ-2019-01896 |
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1997
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/21842
Report No.: Juel-3365
Abstract: In December 1996 our colleague and friend Professor Dr. Karl Holinde died. In his memory we present a summary ofhis scientific work on the following page. The COSY accelerator was running for more than 6000 hours exhibiting a remarkable availability of 94%. While some time was allotted for the development of the machine themajor part namely 67% was used to deliver beams to the internal and external experimental facilities. The development and now routine operation of the stochastic extraction has been an important milestone, both for the accelerator and the experiments that highly benefit from the long and even spill. An equally important achievement was the first acceleration of polarized beams, crossing successfully critical depolarizing resonances. Preparations at the accelerator site have been completed to insert the internal experiment ANKE into the ring as the last of the larger installations. First bench tests of the ANKE magnetic components have been conducted. The Berlin Neutron-Silicon-Ball detector was installed in the TOF area during September. All other experimental installations have finished their initial development phase. The off-line evaluation routines are debugged and data taking goes on. First experimental results of COSY experiments have been published. The GEM-collaboration published fust measurements of full angular distributions and total cross sections for the pp $\rightarrow$ d$\pi^{+}$ reaction from 0.3 to 5 MeV above threshold. The COSY-11 collaboration measured and published the associated strangeness production pp $\rightarrow$ pK$^{+}\Lambda$ 2 MeV above threshold. A third important publication has been done by the EDDA-collaboration evaluating excitation functions of proton-proton elastic scattering cross sectionmeasurements in small steps for proton beam momenta from 1.1 to 3.3 GeV/c. Several other important and interesting measurements were undertaken and their analysis is underway. There are results ofthe TOF-collaboration on the associated strangeness production in the pp $\rightarrow$ pK$^{+}\Lambda$ reaction at proton beam momenta of 2.75 GeV/c and 2.5 GeV/c. About 6000 events are recorded. This exceeds the world data set in the COSY energy range by ab out two orders of magnitude. Proton-proton bremsstrahlung measured at 0.797 GeV/c can be identified above background. The MOMO-collaboration accumulated the two-pion production in the pd $\rightarrow$ $^{3}$He$\pi^{+}\pi^{-}$-reaction at three energies elose and up to 90 MeV above threshold. The COSY-13 collaboration could measure the production of heavy hypernuclei in the U/Bi(p,K) reaction at beam energies of 1.5 and 1.9 GeY. The COSY-11 collaboration continued sucessfully their measurements on strangeness production of pp $\rightarrow$ ppK$^{+}$ K$^{-}$ and experiments with slowly increasing beam momenta scanning the threshold region of the pp $\rightarrow$ pp$\eta$' and pp $\rightarrow$ pp$\eta$ reactions. [...]
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